Writing is in exam is necessary

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We have exam last weak and my friend did not right anything in exam paper but when we went to teacher's home to ask teacher to passed my friend he denies to passed him because he did not right anything.Teacher knowed me very well that's why we went but what we did teacher told us that if she had right something even it wrong i will passed her ,but she had not right anything.so what i can did."Teacher said"